Grundfos SE1 50 Instrucciones De Instalación Y Funcionamiento página 13

7.2 Free-standing submerged installation on ring
stand
Pumps for free-standing submerged installation can stand freely
on the bottom of the pit. The pump must be installed on a ring
stand. See fig. 4.
The ring stand is available as an accessory.
In order to facilitate service on the pump, fit a flexible union or
coupling to the elbow on the discharge port for easy separation.
If a hose is used, make sure that the hose does not buckle and
that the inside diameter of the hose matches that of the pump
discharge port.
If a rigid pipe is used, fit the union or coupling, non-return valve
and isolating valve in the order mentioned, when viewed from the
pump.
If the pump is installed in muddy conditions or on uneven ground,
support the pump on bricks or a similar support.
Proceed as follows:
1. Fit a 90 ° elbow to the pump discharge port and connect the
discharge pipe/hose.
2. Lower the pump into the liquid by means of a chain secured to
the lifting bracket of the pump. We recommend to place the
pump on a plane, solid foundation. Make sure that the pump is
hanging from the chain and not the cable. Make sure that the
pump is standing securely.
3. Hang up the end of the chain on a suitable hook at the top of
the pit and in such a way that the chain cannot come into
contact with the pump housing.
4. Adjust the length of the motor cable by coiling it up on a relief
fitting to ensure that the cable is not damaged during
operation. Fasten the relief fitting to a suitable hook at the top
of the pit. Make sure that the cable is not sharply bent or
pinched.
5. Connect the motor cable.
The free end of the cable must not be submerged, as
Note water may penetrate through the cable into the
motor.
Fig. 4 Free-standing submerged pump on ring stand
7.3 Dry installation
In dry installations, the pump must be installed permanently
outside the pit.
The motor is totally enclosed and watertight. Consequently, it will
not be damaged in case the installation site is flooded.
Precautions
• As the pump is installed outside the pit, make sure that the
liquid level in the pit is high enough to ensure sufficient NPSH.
• Size the suction line according to the length and the desired
pump performance. A possible difference in level between the
pit and the pump inlet must also be taken into account.
• Support the pipework so that no strain or other mechanical
influences are transmitted to the pump. We recommend to
install expansion joints and pipe hangers. See fig. 5.
Fig. 5 Horizontal dry installation with brackets
Pos. Description
1 Expansion joint
2 Non-return valve
3 Isolating valve
4 Pipe hanger
• If a reducer is fitted between the suction line and the pump, it
must be of the eccentric type. The reducer must be fitted so
that the straight edge is upwards to avoid air locks in the
suction line. Air in the suction line may cause cavitation.
See fig. 5.
• Install the pump on a separate foundation, e.g. concrete
foundation. The weight of the foundation should be approx.
1.5 times the weight of the pump. To prevent vibrations from
being transmitted to the building and pipework, we
recommend to place the pump on vibration absorbing material.
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